Global libwacom_get_product_id (const WacomDevice *device): The return value is a signed int but libwacom_match_get_product_id() returns an unsigned int. This may cause compiler warning, but the effective range for product IDs is 16-bit only anyway.
Global libwacom_get_vendor_id (const WacomDevice *device): The return value is a signed int but libwacom_match_get_vendor_id() returns an unsigned int. This may cause compiler warnings, but the effective range for vendor IDs is 16-bit only anyway.